Lutetium

Atomic number

71

Atomic mass (u)

174.9667

Category

Lanthanide

Standard state

Solid

Melting point

1662.85 °C (1936 K)

Boiling point

3401.85 °C (3675 K)

Density (g/cm³)

9.84

Electronegativity (Pauling)

1.27

Electron configuration

[Xe]6s2 4f14 5d1

Oxidation states

+3

Atomic radius (pm)

221

First ionization energy (eV)

5.426

Discovery & recognition

Discovery year / period (PubChem)

1907

Discovery credited to (RSC)

Georges Urbain in Paris, France and independently by Charles James in New Hampshire, USA

Date or period recorded by RSC

1907

Discovery place

Paris, France (first published report); independent work elsewhere

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“In common with many other lanthanides, the main source of lutetium is the mineral monazite.”

Royal Society of Chemistry · occurrence excerpt ↗

Continue the research

Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.